/Engine/Source/Developer/PhysicsUtilities/Public/ConvexDecompTool.h
Utility for turning arbitrary mesh into convex hulls.  InBodySetup BodySetup that will have its existing hulls removed and replaced with results of decomposition.
[IDecomposeMeshToHullsAsync](API\Developer\PhysicsUtilities\IDecomposeMeshToHullsAsync) * CreateIDecomposeMeshToHullAsync()